The Career engine is one that you can earn from achievements and follows you through your rail nation career across games.
It starts off as quite a basic engine, but as you gather achievements they can be invested in different aspects of the engine.
- Tractive force - the number of wagons it can pull - up to 20,
- speed - how fast it goes - up to 250 km/h,
- acceleration - how quickly it accelerates, up to 20,
- reliability - how much maintenance it needs, up to 100%,
- Goods - which era goods it can pull, up to Era 6.
A number of these are limited - so although it may be able to pull 12 waggons, it will be limited in Era 1.